linux-kernel - Re: 2.6.19-rc1: Volanomark slowdown

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1163023652.10806.203.camel@localhost.localdomain>
Date:	Wed, 08 Nov 2006 14:07:32 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Olaf Kirch <okir@...e.de>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, davem@...set.davemloft.net,
	kuznet@....inr.ac.ru, netdev@...r.kernel.org
Subject: Re: 2.6.19-rc1: Volanomark slowdown

On Wed, 2006-11-08 at 23:10 +0100, Olaf Kirch wrote:

> 
> In fixing performance issues, the most obvious explanation isn't always
> the right one. It's quite possible you're right, sure.
> 
> What I'm saying though is that it doesn't rhyme with what I've seen of
> Volanomark - we ran 2.6.16 on a 4p Intel box for instance and it didn't
> come close to saturating a Gigabit pipe before it maxed out on CPU load.
> 

I am running Volanomark in a loopback mode on a 2P woodcrest box 
(4 cores).  So the configuration is a bit different.  

In my testing, the CPU utilization is at 100%.  So
increase in ACKs will cost CPU to devote more
time to process those ACKs and reduce throughput.

> 
> You could count the number of outbound packets dropped on the server.
> 

As I'm running in loopback mode, there are no dropped packets.

Thanks.

Tim

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/